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I have this little chip (256x256px) that are taken from an
orthorectified image, so I have all the coordinate for all them. I want
to use this little image to orthorectify a new image. What are the
right step for this? <br>
Jachym Cepicky ha scritto:
<blockquote cite="mid:20090326065713.GB5625@kocour" type="cite">
the GCPs are located in each image at known locations, you can create
necessary files in a batch script:
- you have to create the group for each image (i.group)
- you have to set the target and ref files for the group (i.target)
- you have to create the POINTS file - manually
try to rectify one image by hand and then see grassdata/LOCATION/MAPSET/group/GROUP/*
however, if the position of GCPs is unknown to you, I'm affraid, you
have to do it by hand
On Wed, Mar 25, 2009 at 03:04:43AM -0700, Petrone Orlando Mauro wrote:
<pre wrap="">Hi to all,
I'm trying to use GRASS 6.4 (installed on UBUNTU) to realize a system to automate the orthorectification process.
I have a group of little images (chip of 256x256 pixel) that I want to use to orthorectify an image.
Can grass use the little chip to create the RPC polynomial without any external action? I try i.points.auto, but I must set the GCP manually...
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